Sixty years ago, on the first day of the Chinese New Year 1942, a Japanese army shocked the world by entering and occupying Singapore, the island-city that had been described as "the impregnable fortress". It was Britain's most shameful military disaster, involving a huge loss of life. Piers Plowright uncovers the tragic tale of misplaced faith, muddle and ultimate betrayal that led to the fall of a fortress. Survivors from all sides give theirtestimony, including a rare interview with the creator of post-war Singapore, Lee Kuan Yew. Producer Vanessa Harrison